"I couldn't figure out how to play off of her," Alexander said of actress Heidi Swedberg's character. "Her instincts for doing a scene, where the comedy was, and mine were always misfiring." He also sort of implied to Stern that other cast members found her "f**king impossible."

Now, Alexander is eating his words in a lengthy statement he tweeted out on Thursday.

"I feel officially awful," he said, apologizing for the statements he made about his former co-star. "The impetus for telling this story was that Howard said, 'Julia Louis-Dreyfus told me you all wanted to kill her.' So, I told the story to try and clarify that no one wanted to kill Heidi."

Taking some of the blame, the 55-year-old actor again went into how he was on "uncertain ground" when it came to how his character should play off Susan. He also claims co-creators Larry David and Jerry Seinfeld "were not sure how that relationship would end."

"They didn't really want George married but all the alternatives seemed predictable," Alexander recalled. "They were always looking for an inventive end to the engagement. So when the comment was made about 'killing,' no one was talking about the actress -- they were talking about the character. And that made a creative light bulb go off apparently."

As any good on-screen fiance would do, Alexander gushed over his co-star and vehemently said sorry. "To Heidi, I personally apologize. You are a sweetheart. I actually launched into this on Stern to defend you," he claimed. "But this is why I'm not a lawyer. Now everybody, calm down and just enjoy the reruns and think, 'Why did he think this wasn't working? This is great.'"